mainfrm.pas

《Delphi开发人员指南》配书原码

unit MainFrm;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

{$I strconvert.inc}

type


  TMainForm = class(TForm)
    btnUpper: TButton;
    edtConvertStr: TEdit;
    btnLower: TButton;
    procedure btnUpperClick(Sender: TObject);
    procedure btnLowerClick(Sender: TObject);
  private
  public
  end;

var
  MainForm: TMainForm;

function InitStrConvert(APrepend, AAppend: String): TStringConvert; stdcall;
  external 'STRINGCONVERTLIB.DLL';

implementation

{$R *.DFM}

procedure TMainForm.btnUpperClick(Sender: TObject);
var
  ConvStr: String;
  FStrConvert: TStringConvert;
begin
  FStrConvert := InitStrConvert('Upper ', ' end');
  try
      ConvStr := edtConvertStr.Text;
      if ConvStr <> EmptyStr then
        edtConvertStr.Text := FStrConvert.ConvertString(ctUpper, ConvStr);
  finally
    FStrConvert.Free;
  end;
end;

procedure TMainForm.btnLowerClick(Sender: TObject);
var
  ConvStr: String;
  FStrConvert: TStringConvert;
begin
  FStrConvert := InitStrConvert('Lower ', ' end');
  try
      ConvStr := edtConvertStr.Text;
      if ConvStr <> EmptyStr then
        edtConvertStr.Text := FStrConvert.ConvertString(ctLower, ConvStr);
  finally
    FStrConvert.Free;
  end;
end;

end.